Carbon fiber surface oiling agent changing method

Abstract

The invention discloses a carbon fiber surface oiling agent changing method. Approximately, the method sequentially comprises the steps of raw material providing, desizing, plasma surface treatment, sizing and the like; impurities originally adsorbed on the surface of carbon fiber are molecularized or even sway through physical and chemical reaction actions of a plasma airflow in the plasma surface treatment process mainly, so that the surface of carbon fiber is roughened, simultaneously functional groups on the surface of carbon fiber are increased, in the subsequent sizing process of carbonfiber, high-quality interface joint is reached between carbon fiber and matrix resin, and then the properties of the carbon fiber composite material are improved.

Description

technical field [0001] The present invention relates to the surface treatment technology of carbon fibers, and aims to provide a carbon fiber surface oil agent replacement method that can effectively replace the oil agent on the carbon fiber surface. Background technique [0002] Carbon fiber, also known as carbonized fiber, can be widely used in various purposes due to its excellent mechanical and electrical properties; most of the carbon fibers seen in the market at present are made of polyacrylonitrile fibers and other carbon fiber precursor fibers (precursor fibers). The formed carbon fiber precursor fiber bundle is obtained by calcination. [0003] The untreated carbon fiber surface has insufficient adhesion, and it has poor transverse properties, such as separation strength and shear strength, so it is less directly utilized, and is usually formed into a carbon fiber composite material combined with a matrix resin according to the application; on the other hand, Becau...

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Problems solved by technology

[0004] In the past, carbon fiber composites made full use of the excellent mechanical properties of carbon fibers, and their matrix resins mostly used thermosetting resin materials, which became so-called thermosetting carbon fiber composites. The biggest difference from thermoplastic carbon fiber composites is that traditional thermosetting The molding time of carbon fiber composite materials is long, resulting in low utilization rate of molds and relatively low production capacity

[0005] However, most of the oils on the surface of commercially available carbon fiber raw materials are thermosetting resin oils designed according to the wettability of thermosetting resins. If such carbon fiber raw materials are to be further made into thermoplastic carbon fiber composite materials, The carbon fiber raw material and the resin will not form a complete joint interface due to the interface mismatch, which becomes the main factor that it cannot be applied to various electrical, electronic parts, mechanical parts and auto parts where injection molding is the main processing method.

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